> Date: Thu, 6 Mar 2014 13:15:50 +0100
> From: [email protected]
> To: [email protected]
> Subject: Re: LF: Re: VLF 29501, signal?
>
> May thanks for the files Paul!
>
> Paul Nicholson wrote:
> > Well that 24dB is a 5 hour integration in 55uHz. It
> > makes a big sharp line on the spectrum though. At
> > VLF that counts as 'armchair'.
>
> Yes. It will never become a popular "realtime chat mode" of course...
>
>
> > No problem. 5 hours compressed into 22.5 seconds
> > and frequency shifted so that 29499 Hz is moved
> > to 400 Hz. wav format 32k samples/sec mono 1.4 Mbyte
> >
> > http://67.207.143.181/wh2xba1_140303a.wav
> >
> > How good is your 'CW ear' I wonder?
>
> Not exactly armchair copy but by looping the file a couple of times for
> "mental integration" I got XBA XBA XBA without any doubt. Yes, the
> second file wh2xba1_140303b.wav was slightly easier to read due to the
> higher CW speed. Thank you for the music Bob!
>
> An MFSK system with integrate-and-dump detectors synchronized to the TX
> should be capable of conveying quite a number of bits per hour. The low
> speed would allow many tones in a small BW. Some tones could even be
> reserved for commonly used words or sentences like "It is not raining in
> Tokyo also" :-)
>
> 73
> Johan
>